Teddy Rogers
@teddy-rogers
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I purchased the Sega Dreamcast PACKAPUNCH RGB 480p SCART cable a few months back. Eventually got around to trying it out yesterday with my Dreamcast. I noticed the picture is very dark when using this cable as-is. With the OSSC I have to turn Pre-ADC Gain from 8 all the way up to the maximum setting of 15 to get the contrast levels correct. I am curious to know if you get the same results with your cable?
In comparison I have similar cables from both Retro Access and thefoo and I have never needed to touch Pre-ADC Gain…
Ted.
Do you have your OLED’s in GAME mode with de-judder/de-blur turned off?
Ted.
March 22, 2019 at 6:30 PM in reply to: OSSC and Magewell Pro Capture HDMI Dual – Flickering Issue #25673Have you tried using the FilterProperty tool to inspect the input from the OSSC? It may help to diagnose the problem. FilterProperty can be found in one of the older Magewell SDK’s. I have uploaded it here if you can’t find it…
https://rapidgator.net/file/8da93c547326c624a23e81b0c04e2838/FilterProperty.zip.html
Ted.
Which firmware are you using, the one with or without audio?
http://junkerhq.net/xrgb/index.php?title=OSSC#Firmware_update
Ted.
There is a way you can make life easier using the Dreamcast and OSSC with just one cable. However you will still need to manually switch between 15/31khz occasionally for those few games that don’t support VGA, if you have them in your collection. My setup is currently a Dreamcast directly connected to an OSSC using a scart cable with 15/31khz selector switch wired in the cable. There is a sync combiner installed in the scart plug for RGBS output. At first I couldn’t get the OSSC to work with the Dreamcast in RGBS as it kept dropping out of sync causing the screen to flicker. To fix this I soldered on pin 20 of the scart plug a 470ohm resistor in series with a 220uF capacitor. This stopped the flickering. On top of that I had to set analogue sync LPF to its highest filter setting (2.5mhz). Having done this I now only need one cable. When I need to use it for non-VGA titles I simply operate the switch on the cable and I’m good to go. There is no need for Toro or any other device and the picture quality is fantastic coming out of the OSSC…
Ted.
Thank you for the updated firmware and features.
Will you be updating the online Junker manual explaining the new features for the uninitiated amongst us?
Ted.
It looks like that because you haven’t (correctly) configured the OSSC. You need to enforce the sampler to 480p and adjust active/backporch settings for H & V to suite your display…
Ted.
Is that really a problem?
No, I can use AV3 for RGBHV. As I mentioned there are some quirks (H.BACKPORCH shifting) with AV3 that I don’t experience with AV1. Whether that is due to the OSSC or something else I don’t know…
Ted.
One thing I do not like about the Toro (this goes for the Akura too) is the slight colour shift/difference with its output. It is particularly noticeable with black colours becoming (crushed) more grey.
I agree with using AV1. For me the reason I would choose this over AV3 is for the combined audio in the SCART connector. The other big reason for me is I often find with AV3 I have to keep adjusting H.BACKPORCH to get the image correctly centred. I have no idea why this keeps shifting slightly, it can be anything from 111 to 115. One of the downsides to using AV1 is that it does not support RGBHV, it kind of works until it looses sync and starts to flicker after a few minutes.
I also agree about the detachable Toro cable coming loose. This is exactly the same problem on the Akura. It is worst thing about the Beharbros products…
Ted.
It looks like the OSSC works perfectly fine to me with a VGA cable…
Ted.
I have a custom VGA cable, it is essentially similar to a standard VGA cable only with a 15/31KHZ selector switch in the middle. I’ve got standard VGA cables bought off eBay and they have all worked fine with the OSSC…
Ted.
Another standard VGA cable, like you already have, with the separate RCA connectors would be fine. I’ve picked a few up on eBay and they have all worked okay for me.
Between the OSSC and Akura I’d stick with the OSSC. I have my Dreamcast hooked up directly to the OSSC with a custom VGA cable that has a built in 15/31khz selector switch. I have the Akura and it does not output 240p and 480i games. It also does not support line doubling that the OSSC supports for multiple resolutions. I also find the Akura shifts the image to the far right of the screen. If you do want to get a VGA box to accompany the OSSC (for 15/31khz switching), though it’s probably a little overkill for your needs, I would certainly recommend the Toro…
Ted.
If you are referring to those square dotted lines in the screenshots above then as far as I am aware it isn’t anything to do with the Dreamcast’s dithering. The dithering lines are straight and vertical where-as those in your sreeenshot are dotted and scattered. If they are always located at the same place when you use your Dreamcast I’d likely think it’s related to the Dreamcast’s hardware than the cable. However trying another cable would be first and cheapest option to rule out…
Ted.
The dithering is normal on the Dreamcast and most visible and pronounced when displayed through VGA. A lot of people complain when they get a VGA cable because there are a lot of vertical lines on screen. Those vertical lines are due to the dithering and the screen mode being squished or stretched because of incorrect DTV timings. A perfect image should look something similar to this…
http://i67.tinypic.com/14kgr3o.jpg
Ted.
Maybe check your VGA cable too, do you have another to test?
Ted.
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